Movies Database

Add Android SDK and JDK to version catalog

Each of the modules contains its own build.gradle.kts. There are several versions listed in these modules, and it's a good idea to keep them in sync. To do this, we'll add them to our version catalog and reference them in the build scripts.

First, we add the versions we want to use to the version catalog.

We can do something similar for the Java versions

show in full file gradle/libs.versions.toml

[versions]
// ...
ksp = "2.3.9"

compileSdk = "37"
targetSdk = "37"
minSdk = "24"

javaVersion = "VERSION_11"

[libraries]
// ...
[plugins]
// ...

Now we replace the hardcoded versions in app/build.gradle.kts, data/build.gradle.kts, and repository/build.gradle.kts. The changes in all three files will look the same.

show in full file app/build.gradle.kts

// ...
android {
    namespace = "com.androidbyexample.movies"
    compileSdk {
//      version = release(37)
        version = release((libs.versions.compileSdk.get().toInt()))
    }

    defaultConfig {
        applicationId = "com.androidbyexample.movies"
//      minSdk = 24
//      targetSdk = 37
        minSdk = libs.versions.minSdk.get().toInt()
        targetSdk = libs.versions.targetSdk.get().toInt()
        versionCode = 1
        versionName = "1.0"

        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
    }
    // ...
    }
    compileOptions {
//      sourceCompatibility = JavaVersion.VERSION_11
//      targetCompatibility = JavaVersion.VERSION_11
        sourceCompatibility = JavaVersion.valueOf(libs.versions.javaVersion.get())
        targetCompatibility = JavaVersion.valueOf(libs.versions.javaVersion.get())
    }
    buildFeatures {
        // ...
}
// ...

This helps ensure consistency and reduce maintenance burden over time.

At this point, nothing will visibly change in the application, but it should still build and run.

---

All code changes

CHANGED: app/build.gradle.kts

plugins {
    alias(libs.plugins.android.application)
    alias(libs.plugins.kotlin.compose)
    id("kotlin-parcelize")
}

android {
    namespace = "com.androidbyexample.movies"
    compileSdk {
//      version = release(37)
        version = release((libs.versions.compileSdk.get().toInt()))
    }

    defaultConfig {
        applicationId = "com.androidbyexample.movies"
//      minSdk = 24
//      targetSdk = 37
        minSdk = libs.versions.minSdk.get().toInt()
        targetSdk = libs.versions.targetSdk.get().toInt()
        versionCode = 1
        versionName = "1.0"

        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            optimization {
                enable = false
            }
        }
    }
    compileOptions {
//      sourceCompatibility = JavaVersion.VERSION_11
//      targetCompatibility = JavaVersion.VERSION_11
        sourceCompatibility = JavaVersion.valueOf(libs.versions.javaVersion.get())
        targetCompatibility = JavaVersion.valueOf(libs.versions.javaVersion.get())
    }
    buildFeatures {
        compose = true
    }
}

dependencies {
    implementation(libs.androidx.navigation3.ui)
    implementation(libs.androidx.navigation3.runtime)
    implementation(libs.androidx.material3.adaptive.navigation3)
    implementation(platform(libs.androidx.compose.bom))
    implementation(libs.androidx.activity.compose)
    implementation(libs.androidx.compose.material3)
    implementation(libs.androidx.compose.ui)
    implementation(libs.androidx.compose.ui.graphics)
    implementation(libs.androidx.compose.ui.tooling.preview)
    implementation(libs.androidx.core.ktx)
    implementation(libs.androidx.lifecycle.runtime.ktx)
    testImplementation(libs.junit)
    androidTestImplementation(platform(libs.androidx.compose.bom))
    androidTestImplementation(libs.androidx.compose.ui.test.junit4)
    androidTestImplementation(libs.androidx.espresso.core)
    androidTestImplementation(libs.androidx.junit)
    debugImplementation(libs.androidx.compose.ui.test.manifest)
    debugImplementation(libs.androidx.compose.ui.tooling)
}

CHANGED: data/build.gradle.kts

plugins {
    alias(libs.plugins.android.library)
    alias(libs.plugins.ksp)
}

android {
    namespace = "com.androidbyexample.movies.data"
    compileSdk {
//      version = release(37)
        version = release(libs.versions.compileSdk.get().toInt())
    }

    defaultConfig {
//      minSdk = 24
        minSdk = libs.versions.minSdk.get().toInt()

        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
        consumerProguardFiles("consumer-rules.pro")
    }
    compileOptions {
//      sourceCompatibility = JavaVersion.VERSION_11
//      targetCompatibility = JavaVersion.VERSION_11
        sourceCompatibility = JavaVersion.valueOf(libs.versions.javaVersion.get())
        targetCompatibility = JavaVersion.valueOf(libs.versions.javaVersion.get())
    }

}

dependencies {
    implementation(libs.room.runtime)
    implementation(libs.room.ktx)
    ksp(libs.room.compiler)

    implementation(libs.androidx.appcompat)
    implementation(libs.androidx.core.ktx)
    implementation(libs.material)
    testImplementation(libs.junit)
    androidTestImplementation(libs.androidx.espresso.core)
    androidTestImplementation(libs.androidx.junit)
}

CHANGED: gradle/libs.versions.toml

[versions]
agp = "9.2.1"
coreKtx = "1.19.0"
junit = "4.13.2"
junitVersion = "1.3.0"
espressoCore = "3.7.0"
lifecycleRuntimeKtx = "2.11.0"
activityCompose = "1.13.0"
kotlin = "2.4.0"
composeBom = "2026.06.01"
navigation = "1.1.4"
material3AdaptiveNav3 = "1.3.0-rc01"
appcompat = "1.7.1"
material = "1.14.0"

room = "2.8.4"
ksp = "2.3.9"

compileSdk = "37"
targetSdk = "37"
minSdk = "24"

javaVersion = "VERSION_11"

[libraries]
androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
junit = { group = "junit", name = "junit", version.ref = "junit" }
androidx-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }
androidx-espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" }
androidx-lifecycle-runtime-ktx = { group = "androidx.lifecycle", name = "lifecycle-runtime-ktx", version.ref = "lifecycleRuntimeKtx" }
androidx-activity-compose = { group = "androidx.activity", name = "activity-compose", version.ref = "activityCompose" }
androidx-compose-bom = { group = "androidx.compose", name = "compose-bom", version.ref = "composeBom" }
androidx-compose-ui = { group = "androidx.compose.ui", name = "ui" }
androidx-compose-ui-graphics = { group = "androidx.compose.ui", name = "ui-graphics" }
androidx-compose-ui-tooling = { group = "androidx.compose.ui", name = "ui-tooling" }
androidx-compose-ui-tooling-preview = { group = "androidx.compose.ui", name = "ui-tooling-preview" }
androidx-compose-ui-test-manifest = { group = "androidx.compose.ui", name = "ui-test-manifest" }
androidx-compose-ui-test-junit4 = { group = "androidx.compose.ui", name = "ui-test-junit4" }
androidx-compose-material3 = { group = "androidx.compose.material3", name = "material3" }

androidx-navigation3-runtime = { module = "androidx.navigation3:navigation3-runtime", version.ref = "navigation" }
androidx-navigation3-ui = { module = "androidx.navigation3:navigation3-ui", version.ref = "navigation" }
androidx-material3-adaptive-navigation3 = { group = "androidx.compose.material3.adaptive", name = "adaptive-navigation3", version.ref = "material3AdaptiveNav3" }
androidx-appcompat = { group = "androidx.appcompat", name = "appcompat", version.ref = "appcompat" }
material = { group = "com.google.android.material", name = "material", version.ref = "material" }

room-runtime = { group = "androidx.room", name = "room-runtime", version.ref = "room" }
room-ktx = { group = "androidx.room", name = "room-ktx", version.ref = "room" }
room-compiler = { group = "androidx.room", name = "room-compiler", version.ref = "room" }

[plugins]
android-application = { id = "com.android.application", version.ref = "agp" }
kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
android-library = { id = "com.android.library", version.ref = "agp" }

ksp = { id = "com.google.devtools.ksp", version.ref = "ksp" }

CHANGED: repository/build.gradle.kts

plugins {
    alias(libs.plugins.android.library)
}

android {
    namespace = "com.androidbyexample.movies.repository"
    compileSdk {
//      version = release(37)
        version = release(libs.versions.compileSdk.get().toInt())
    }

    defaultConfig {
//      minSdk = 24
        minSdk = libs.versions.minSdk.get().toInt()

        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
        consumerProguardFiles("consumer-rules.pro")
    }
    compileOptions {
//      sourceCompatibility = JavaVersion.VERSION_11
//      targetCompatibility = JavaVersion.VERSION_11
        sourceCompatibility = JavaVersion.valueOf(libs.versions.javaVersion.get())
        targetCompatibility = JavaVersion.valueOf(libs.versions.javaVersion.get())
    }

}

dependencies {
    implementation(libs.androidx.appcompat)
    implementation(libs.androidx.core.ktx)
    implementation(libs.material)
    testImplementation(libs.junit)
    androidTestImplementation(libs.androidx.espresso.core)
    androidTestImplementation(libs.androidx.junit)
}